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United States Patent | 5,663,688 |
Delmas ,   et al. | September 2, 1997 |
The present invention relates to a method of enhancing the noise Immunity of a phase-locked loop. The phase-locked loop includes a comparator and apparatus for inhibiting the action of the comparator on the phase-locked loop. According to the method, the inhibition is lifted during a main time window resulting from the intersection of a first time window derived from the input signal of the phase-locked loop, and of a second time window derived from the loop-return signal.
Inventors: | Delmas; Christian (Saint Egreve, FR); Dell'Ova; Francis (St. Hllaire du Touvet, FR); Paillardet; Frederic (Grenoble, FR) |
Assignee: | Thomson Multimedia S.A. (Courbevoie, FR) |
Appl. No.: | 553376 |
Filed: | April 2, 1996 |
PCT Filed: | June 3, 1994 |
PCT NO: | PCT/FR94/00659 |
371 Date: | April 2, 1996 |
102(e) Date: | April 2, 1996 |
PCT PUB.NO.: | WO94/29964 |
PCT PUB. Date: | December 22, 1994 |
Jun 08, 1993[FR] | 93 06836 |
Current U.S. Class: | 331/14; 327/156; 327/157; 327/159; 331/1A; 331/20; 331/25; 348/536; 360/51 |
Intern'l Class: | H03L 007/08 |
Field of Search: | 331/1 A,11,14,17,20,25,DIG. 7 327/156-159 348/536,540,542,547 360/51 |
4047223 | Sep., 1977 | Hofmann | 348/542. |
4435657 | Mar., 1984 | Taguchi et al. | 307/516. |
4872155 | Oct., 1989 | Yokogawa et al. | 369/59. |
5008629 | Apr., 1991 | Ohba et al. | 328/14. |
5019907 | May., 1991 | Murakoshi et al. | 348/542. |
5028885 | Jul., 1991 | Voigt et al. | 331/1. |
Foreign Patent Documents | |||
2067372 | Jul., 1981 | GB. |